package com.cxt.interceptor;//package com.cxt.interceptor;

import com.alibaba.fastjson.JSON;
import com.cxt.constant.JwtClaimsConstant;
import com.cxt.context.BaseContext;
import com.cxt.properties.JwtProperties;
import com.cxt.result.Result;
import com.cxt.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 管理端-jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenUserInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtProperties jwtProperties;

    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }
        //1、从请求头中获取令牌
        String token = request.getHeader(jwtProperties.getUserTokenName());
        //2、校验令牌
        try {
            log.info("jwt校验:{}", token);
            Claims claims = JwtUtil.parseJWT(jwtProperties.getUserSecretKey(), token);
            Long userId = Long.valueOf(claims.get(jwtProperties.getUserIdName()).toString());
            log.info("当前用户的id：{}", userId);
            BaseContext.setCurrentId(userId);
            return true;
        } catch (Exception ex) {
            Result<String> result = Result.error("notLogin");
            String jsonString = JSON.toJSONString(result);
            response.getWriter().write(jsonString);
            //设置响应格式
            response.setContentType("application/json;charset=utf-8");
            return false;
        }
    }

}
